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Message-ID: <06565532-987a-465a-b2ab-a03fce7279e1@kernel.org>
Date: Tue, 21 May 2024 10:58:07 +0200
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Subject: Re: [PATCH RFC 1/2] dt-bindings: soc: qcom,smsm: Allow specifying
 mboxes instead of qcom,ipc
To: Luca Weiss <luca@z3ntu.xyz>, Rob Herring <robh@kernel.org>,
 Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Cc: ~postmarketos/upstreaming@lists.sr.ht, phone-devel@vger.kernel.org,
 Bjorn Andersson <andersson@kernel.org>,
 Konrad Dybcio <konrad.dybcio@linaro.org>,
 Krzysztof Kozlowski <krzk+dt@kernel.org>, Conor Dooley
 <conor+dt@kernel.org>, Andy Gross <agross@kernel.org>,
 linux-arm-msm@vger.kernel.org, devicetree@vger.kernel.org,
 linux-kernel@vger.kernel.org
References: <20240424-smsm-mbox-v1-0-555f3f442841@z3ntu.xyz>
 <2729475.mvXUDI8C0e@g550jk> <1ab150cd-68f0-4153-8d4e-5bd30bb01dfe@linaro.org>
 <12437992.O9o76ZdvQC@g550jk>
From: Krzysztof Kozlowski <krzk@kernel.org>
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In-Reply-To: <12437992.O9o76ZdvQC@g550jk>
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On 20/05/2024 17:11, Luca Weiss wrote:
> Hi Krzysztof
> 
> Ack, sounds good.
> 
> Maybe also from you, any opinion between these two binding styles?
> 
> So first using index of mboxes for the numbering, where for the known
> usages the first element (and sometimes the 3rd - ipc-2) are empty <>.
> 
> The second variant is using mbox-names to get the correct channel-mbox
> mapping.
> 
> -               qcom,ipc-1 = <&apcs 8 13>;
> -               qcom,ipc-2 = <&apcs 8 9>;
> -               qcom,ipc-3 = <&apcs 8 19>;
> +               mboxes = <0>, <&apcs 13>, <&apcs 9>, <&apcs 19>;
> 
> vs.
> 
> -               qcom,ipc-1 = <&apcs 8 13>;
> -               qcom,ipc-2 = <&apcs 8 9>;
> -               qcom,ipc-3 = <&apcs 8 19>;
> +               mboxes = <&apcs 13>, <&apcs 9>, <&apcs 19>;
> +               mbox-names = "ipc-1", "ipc-2", "ipc-3";

Sorry, don't get, ipc-1 is the first mailbox, so why would there be <0>
in first case? Anyway, the question is if you need to know that some
mailbox is missing. But then it is weird to name them "ipc-1" etc.

Best regards,
Krzysztof